HONG had an ambition to be an excellent policeman as a child. His supervisor appreciates his considerable contribution and transfers him to work as a undercover. Coincidentally, he meets HEY on his last beat before his transfer. HEY has been in the police force for years and rich in experience but his recklessness makes LIN, his ex-classmate and supervisor dissatisfy. Fortunately, FAN, his best friend and partner, is their mediator. HONG almost damages HEY and FAN’S plot of arresting CRAZY BILL, a drug dealer. HONG’S brilliant performance during his training gains LIN’S recommendation to join the ANTI-CRIME SQUAD. His first assignment is to investigate the blackmailing of mini-bus drivers, which is masterminded by UNCLE THUNDER, and succeeds in having KIM, an informant, to testify. HONG is sent to protect the informant but feels quite at a loss when he meets his mother, BO, in his mission.

The exposure of HONG’S identity lets UNCLE THUNDER off the hook and leaves in rage. HONG feels regret for this. HEY knows UNCLE THUNDER collects ransoms in the name of cleaning fees and “cleans” THUNDER’S territory. This leads to LIN’S dissatisfaction. FAN has a fight with his landlady and moves to HEY’S home. HEY is dissatisfied with his career and CHI, his wife, always comforts him. His partner, TI, was a teen mother and has a son named FAI. HEY takes care of her very much and makes TI admire him secretly. HONG meets SUM when accompanying his mother to buy a used car and mistakes SUM for his puppy lover, YEE. UNLCE THUNDER’S men have penetrated in the construction site of HOME OWNER’S SCHEME to seek for interests and BULLET is in charge of this. HEY and HONG follow order to get BULLET but he resists.

HONG and HEY manages to arrest BULLET, who knows it is THUNDER’S trick that leads to his arrest later. He sends his man, PINK PANTHER, to threaten HO’S family so as to make HO quit from testifying against him and set him free. TI’S work makes her late in picking up FAI, who is missing. She is worried about her son very much. HEY consoles her and finds FAI at his home. TI’S father, WON, dislikes TI’S maternity without marriage. It turns their relationship sour. KIU, WON’S sister, works as their mediator. BULLET lets the police collect enough evidence to charge UNCLE THUNDER in order to replace him as the new boss of the gang. HONG visits SUM’S school to investigate the triad penetration of schools and tries to date SUM whom HONG mistakes her for YEE.

SUM discovers one of her student, PING involving in shoplifting and traces him but in vain as being discovered by other gangsters. Fortunately, her alertness helps her escape from mishap. Then she succeeds in persuading PING into cooperating with the SQUAD to rectify the gang of shoplifting. AT last, HONG accidentally makes clear that SUM is not her puppy lover. FAN is embarrassed when he expresses his admiration to LAI, his colleague, who only treats him as her elder friend. Coincidentally, TI cannot join KIU for concert and let FAN go with KIU. However, KIU finds FAN is such a miser that the date ends in disagreement. The SQUAD tries to hook BULLET, who blackmails the new flat owners in the name of HUNG KEE CONSTSRUCTION CO., by borrowing a flat from TI’S family. KIU makes FAN pay for a meal for this request from the SQUAD. FAN can do nothing but agree.

In order to get KIU’S cooperation; FAN pays her a meal. KIU tricks FAN to pay for all neighbors instead of hers only. It really hurts FAN, the miser. KIU carelessly discloses the plot and let BULLET off the hook. This makes the SQUAD very angry. HONG tries to engage with SUM and shows his fondness in the excuse of computer problems. Finally, he is distressed when he knows SUM has a boy friend but he still cares about her. Because of the undesirable returns from renovations, BULLET orders his gang to threaten the tenants and damage the flats of those who do not offer them the renovation works. KIU’S flat is damaged seriously because of helping the police and she requires FAN to be responsible for the renovation. For cutting costs, BULLET steals materials from other construction sites and has KEUNG, HEY’S brother-in-law joined him. They resist when the SQUAD goes after them.